Thanks for the information. I upgrade but I can not generate the PDF.I found in a search that a user have disabled php extensions to solve the above memory problem.In the php.ini I removed some php extensions and I found the "apc.so" extension was causing this problem.I try to tweak the apc parameters (apc.shm_size, apc.max_file_size, etc ...) but with no success.So, if you have this problem try to remove the php "apc.so" extension.Problem solvedThanks very much for your comments and best regards,Daniel Pereira